Roll



March 9, 1954 D A, KUNIHQLM 2,671,262

ROLL

Filed Dec. 15, 1950 INVENTOR DAvlD A. KuNnHoLM BY Mwgw ATTORNEYS Patented Mar. 9, 1954 UNITED STATES PATENT OFFICE Rodney Hunt Machine Company,

Orange,

Mass., a corporation of Massachusetts Application December 15, 1950, Serial No. 200,949

(Cl. :Z9- 123) 3 Claims.

This invention relates to shaft-supported rolls and more particularly to means for removing a tightly fitted shaft from the end of a roll.

The present invention relates to rolls of metal, wood, rubber, or other material. Such rolls are used in many industries .and are made with various surface configurations for a variety of uses. In making such rolls it is common practice to have stub shafts permanently set in the roll body by a force, drive or shrink lit commonly termed an interference fit so that the shafts will be rigidly connected and functionally integral with the rolls. The terms "force fit, shrink fit and interference t as used in this application have the meanings commonly recognized in the art as explained on pages 922 and 923 of Marks Mechanical Engineers Handbook, (Fourth Edition) published 1941 by McGraw Hill Book Company, Inc.

The principal item of cost of a roll is usually in the construction of the roll body and this roll body usually has a relatively long life. The shaft, however, is smaller than the roll body and is subjected to greater stresses, Wear and possibility of damage so that frequently the shaft is broken or so Worn as to be unuseable while there is still a long period of useful life remaining in the roll itself.

In many cases, however, when the shaft is worn or broken the entire roll is discarded because of the diiiiculty and expense involved in repairing or replacing the shaft. Under present practice, it is necessary to drill or bore out the worn or broken shaft and replace it with a new shaft. This is a difficult, expensive procedure requiring skilled mechanics and expensive equipment, neither of which is ordinarily available in the usual mill Where rolls are used. It is ordinarily necessary for the user to return the entire roll to the manufacturer for shaft replacement thus requiring a long period of shut down while the roll is out and also involving shipping and handling costs. If, due to the boring or drilling operation, it is necessary to replace the Worn or broken shaft with a slightly larger shaft, the bearings ofthe machine must also be modified with consequent further cost and delay. This difficulty has long been recognized and many expedients have been tried without success in an eiort to provide a roll in which the shafts were at once firmly secured and easily removable. i ,t

I have found that these difficulties can be over-A ly found in mills. Accordingly, it is a principal object of the present invention to provide a roll having stub shafts firmly and securely mounted therein in such a way that they may be easily and quickly removed.

It is also an object to provide a novel means for removing a shaft which is effective regardless of the nature or location of the point of failure of the shaft.

It is a further object to provide a novel means for removing a shaft from a roll head which makes possible the replacement of the shaft by a standard shaft of the same size.

Other objects and advantages Will become apparent as the description proceeds in connection with accompanying drawings in which;

Figure 1 is a fragmentary sectional view of a roll and shaft assembly embodying one form of the invention; and

Figure 2 is a similar view illustrating another form of the invention.

Referring now to Figure 1, I0 indicates generally a roll of the type which is particularly adapted for use in cloth treating cr finishing ap paratus such as squeezing, wringing, washing or dyeing apparatus.

The roll body II may be 0f different shapes for different purposes but is often generally cylindrical in shape and may be solid or hollow. In the embodiment shown, the main body portion of the roll II is cylindrical and hollow having at each end an end surface I2 and an inner surface I3. Each end of the body II is closed by a head I4 which is provided with an annular end flange I5 of the same diameter as the body II and a central body portion I6 extending into roll body I I with close fit, such as a drive, force, or shrink t. The heads I4 are forced into body II until the inner surface II of flanges I5 abut the end of the body I I. The heads may then be secured in place by welding, or by bolts or other suitable means to prevent relative movement between the body and the head. The body and the head may be of metal, or other suitable material depending upon the service requirements of the particular installation and the body and head may be of the same or different materials. Each head I4 is provided with a central recess I8 in axial alignment with the body II. A shaft I9 is forced into the head Il with a suitable drive, shrink, force orvother interference fit. The shaft, in its .assembled position, is usually spaced from the bottom of the recess I8 forming a chamber 20 of sufficient depth to expose at least a part of the inner end of a passage 2| which extends outwardly from the chamber to the surface of the body portion of the head. The outer end of the passage is sealed with a suitable threaded plug 22 before assembly of the head with the roll body.

A passage 23 extends into head I4 from its outer face and terminates in passage 22. The outer end of the passage 23 is provided with a suitable fitting 24 or similar connection to accommodate a grease gun or other uid pressure device. During assembly of the shaft I9 in the head I4, the tting is removed so as Ato provide la vent for the space 20.

If, after a period of continued use, the shaft IS becomes unserviceable because of breakage or excessive Wear, it may be quickly and easily re- H moved from the head I4 by forcing non-compressble fiuid such as grease or o'il into rthe space 20 under pressure through passages '2l and 23. Conventional high pressure grease guns or other lubricating equipment may :be conveniently used for this purpose. By reason of the high pressure existing in the chamber 20 which acts over the relatively large end surface of the shaft, an out- Wardly directed force may be readily established which is of suncient magnitude to force Vthe shaft I9 smoothly out of the head I4. It `will be noted that this operation may be effected without damage to the recess 8. In prior 'removal operations performed by boring or drilling, socring of the Walls of recess I8 was, in most cases. practically unavoidable. vThis necessitated the refinishing of recess I-B to a slightly larger'diameter requiring the subsequent installation of a slightly larger non-standard shaft.

Referring now to Figure 2, which illustrates a modied form of the invention, 39 indicates generally a roll and shaft assembly having a roll body SI which may be identical to the body il. A head 32 having an external configuration and a central recess 33 identical to that of head M is assembled in the body EI as described above.

A shaft 35 is force fitted or shrink fitted into recess '33 and its inner end is usually spaced from the bottom of the recess 33 to provide a chamber A central drilled passage 35 ex tends axially through the Vshaft '35 and connects the chamber 34 with the outei` exposed end of the shaft. After installation of the shaft, the outer end of the passage 3S is closed With a f1tting 31 similar to the fitting 2d for connection to a grease gun or .iiuid pressure device. When removal and replacement of the shaft '35 becomes necessary, pressure fluid is supplied through tting 3l and passage 39 to chamber 34 and the duid acts in the manner previously described to eject the shaft smoothly and quickly without damage to the recess 33.

particular advantage of this form of the invention resides in the fact that it may be incorporated in conventional rolls Without modification of the roll bodyor head.

From the foregoing it will be apparent that the present invention provides a means for simply, quickly', ,and inexpensively removing a damaged shaft from the roll head, thus allowing the use of the roll ,throughout its full service life. Because .of the simplicity of the arrangement, the removal of the shaft may be accomplished by unskilled personnel using equipment ordinarily available in a mill. Further, because of a substantial reduction of the time needed t effect replacement of a Worn or broken shaft the Alength of the out-of-service period is minimized.

While the invention has been .herein described and illustrated with reference to a rollparticularly adapted for use in cloth treating or finishing apparatus it will be understood that the ,invention has equalapplication to printing press rolls or .other rolls of the generic ytype disclosed.

The invention may be embodied in other specic forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by Ithe appended claims rather than by the foregoing description, and all changes which come Within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

What is desired to be claimed and secured by United States Letters Patent is:

l. A roll and 'shaft assembly comprising; a hollow cylindrical roll body; a roll head secured at the end of said body, said head having a cylindrical recess and a plurality of angularly related intercommunicating passages, each of said passages leading to the exterior of said head and one of said passages communicating at its inner end .with the inner end of said recess, a cylindrical shaft positioned in said recess with an interference fit, the end of said shaft being spaced from the bottom of said recess, whereby fluid under pressure supplied to the outer end of the other of said passages, will be applied through said one passage to said recess and Will be effective to drive said shaft from said recess.

2. A roll and shaft Vassembly comprising; a hollow cylindrical roll body; a roll head secured in the end of said body, said head having a cylindrical recess coaxial with said body; a solid cylindrical shaft receivedwithin said vrecess with an interference t, the end of the shaft being spaced from the bottom of said recess to provide a chamber therebetween, a rst passage in said head substantially normal to the axis of said recess connecting said chamber with the exterior of said head; a second passage substantially parallel with the axis of said recess connecting the outer exposed surface of said head with said first passage, whereby fluid under pressure supplied to the youter `end of said second passage will be applied through said first passage'to said chamber and lwill be effective to drive said shaft from said recess.

3. A roll and shaft assembly comprising; a hollow cylindrical roll body; a roll head secured in the end of said body, said head having a cylindrical `recess coaxial with said body and at least one passage leading to the exterior of said Yhead and communicating at its inner end with the inner end of said recess, a solid cylindrical shaft positioned in said recess with an interference fit, the end of said shaft being spaced from the bottom of said recess, whereby duid under pressure supplied to the outer end of said passage Will be applied through said passage to said recess and will be effective to drive said shaft from said recess.

DAVID A. KUNIHOLM.

References cited in lthe sie of this patent UNITED sTA'rss PATEN'rs Number Name Date 776,000 Turner Nov. 29, 1904 1,314,342 Lawrence Aug. 26, .1.919 1,543,897 Baker June 30, 1925 2,407,471 Burk Sept. 1.0, 1946 2,439,692 McKay Apr. 13, 1948 FOREIGN PATENTS Number Country Date 683,932 Germany Nov. i8, 1939 

